Samsung Had my phone traded in, but delaying my order for new phone Nationwide

I had purchased a new Note 8 mobile which I had received on 12/13/2017. I had used the offer to trade in my Note 5 mobile ($400) for this purchase. When I recevied the Note 8, I could see some scratches on the mobile.  I had called the customer care immediately and they had asked me to send both the devices (Note 5 and 8) and place a new order. I had sent my trade-in device (Note 5) on 12/19/2017.

I had called Customer service again on 12/20/2017 before returning my Note 8 regarding the new replacement order. Customer representative told me that - Since I had already traded in my Note 5, I would receive a $400 coupon within 3-5 days which I can use for the new order of Note 8. I believed the same and sent the Note 8 back to Samsung. When I called customer service again regarding the coupon, they started saying that coupon would take 3-4 weeks to be sent to me. Now I am left with no phone and am depending on my friends for any phone calls. I tried to explain the same to Samsung multiple times, but I have not got any proper solution. I am still waiting for the $400 coupon to place a new order.